www.google.comをpingできません。ただし、IPアドレスをpingすることはできます。
ping 74.125.237.142
最初はDNS設定に問題があると思いました。しかし、私は、、resolv.conf再hosts確認しましたhostname。どちらも正しいです。
以下を使用してすべてのファイアウォールルールを消去するとき：
iptables -F
それからping www.google.com仕事
したがって、問題は依然としてファイアウォールまたはNAT設定にあります。
誰でもアイデアを提供できますか？ルールはどのように作りますかiptables？
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
13 1476 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
1 80 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
34 6030 INPUT_direct all -- * * 0.0.0.0/0 0.0.0.0/0
34 6030 INPUT_ZONES_SOURCE all -- * * 0.0.0.0/0 0.0.0.0/0
34 6030 INPUT_ZONES all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_direct all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_IN_ZONES_SOURCE all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_IN_ZONES all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_OUT_ZONES_SOURCE all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_OUT_ZONES all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 17 packets, 2694 bytes)
pkts bytes target prot opt in out source destination
82 9498 OUTPUT_direct all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FORWARD_IN_ZONES (1 references)
pkts bytes target prot opt in out source destination
0 0 FWDI_public all -- A * 0.0.0.0/0 0.0.0.0/0
0 0 FWDI_public all -- p2p1 * 0.0.0.0/0 0.0.0.0/0
0 0 FWDI_public all -- + * 0.0.0.0/0 0.0.0.0/0
Chain FORWARD_IN_ZONES_SOURCE (1 references)
pkts bytes target prot opt in out source destination
Chain FORWARD_OUT_ZONES (1 references)
pkts bytes target prot opt in out source destination
0 0 FWDO_public all -- * A 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_public all -- * p2p1 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_public all -- * + 0.0.0.0/0 0.0.0.0/0
Chain FORWARD_OUT_ZONES_SOURCE (1 references)
pkts bytes target prot opt in out source destination
Chain FORWARD_direct (1 references)
pkts bytes target prot opt in out source destination
Chain FWDI_public (3 references)
pkts bytes target prot opt in out source destination
0 0 FWDI_public_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDI_public_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDI_public_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FWDI_public_allow (1 references)
pkts bytes target prot opt in out source destination
Chain FWDI_public_deny (1 references)
pkts bytes target prot opt in out source destination
Chain FWDI_public_log (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_external (0 references)
pkts bytes target prot opt in out source destination
0 0 FWDO_external_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_external_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_external_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FWDO_external_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FWDO_external_deny (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_external_log (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_public (3 references)
pkts bytes target prot opt in out source destination
0 0 FWDO_public_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_public_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_public_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FWDO_public_allow (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_public_deny (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_public_log (1 references)
pkts bytes target prot opt in out source destination
Chain INPUT_ZONES (1 references)
pkts bytes target prot opt in out source destination
0 0 IN_public all -- A * 0.0.0.0/0 0.0.0.0/0
16 3011 IN_public all -- p2p1 * 0.0.0.0/0 0.0.0.0/0
18 3019 IN_public all -- + * 0.0.0.0/0 0.0.0.0/0
Chain INPUT_ZONES_SOURCE (1 references)
pkts bytes target prot opt in out source destination
Chain INPUT_direct (1 references)
pkts bytes target prot opt in out source destination
Chain IN_dmz (0 references)
pkts bytes target prot opt in out source destination
0 0 IN_dmz_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_dmz_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_dmz_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain IN_dmz_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW
Chain IN_dmz_deny (1 references)
pkts bytes target prot opt in out source destination
Chain IN_dmz_log (1 references)
pkts bytes target prot opt in out source destination
Chain IN_external (0 references)
pkts bytes target prot opt in out source destination
0 0 IN_external_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_external_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_external_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain IN_external_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW
Chain IN_external_deny (1 references)
pkts bytes target prot opt in out source destination
Chain IN_external_log (1 references)
pkts bytes target prot opt in out source destination
Chain IN_home (0 references)
pkts bytes target prot opt in out source destination
0 0 IN_home_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_home_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_home_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain IN_home_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:631 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 224.0.0.251 udp dpt:5353 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:137 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:138 ctstate NEW
Chain IN_home_deny (1 references)
pkts bytes target prot opt in out source destination
Chain IN_home_log (1 references)
pkts bytes target prot opt in out source destination
Chain IN_internal (0 references)
pkts bytes target prot opt in out source destination
0 0 IN_internal_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_internal_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_internal_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain IN_internal_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:631 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 224.0.0.251 udp dpt:5353 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:137 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:138 ctstate NEW
Chain IN_internal_deny (1 references)
pkts bytes target prot opt in out source destination
Chain IN_internal_log (1 references)
pkts bytes target prot opt in out source destination
Chain IN_public (3 references)
pkts bytes target prot opt in out source destination
34 6030 IN_public_log all -- * * 0.0.0.0/0 0.0.0.0/0
34 6030 IN_public_deny all -- * * 0.0.0.0/0 0.0.0.0/0
34 6030 IN_public_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain IN_public_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW
34 6030 ACCEPT udp -- * * 0.0.0.0/0 224.0.0.251 udp dpt:5353 ctstate NEW
Chain IN_public_deny (1 references)
pkts bytes target prot opt in out source destination
Chain IN_public_log (1 references)
pkts bytes target prot opt in out source destination
Chain IN_work (0 references)
pkts bytes target prot opt in out source destination
0 0 IN_work_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_work_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 IN_work_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain IN_work_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 224.0.0.251 udp dpt:5353 ctstate NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:631 ctstate NEW
Chain IN_work_deny (1 references)
pkts bytes target prot opt in out source destination
Chain IN_work_log (1 references)
pkts bytes target prot opt in out source destination
Chain OUTPUT_direct (1 references)
pkts bytes target prot opt in out source destination
ベストアンサー1
UDP ポート 53 を許可するルールはありません。 UDP ポート 53 がないと DNS を取得できないため、名前解決に失敗することは驚くべきことではありません。
ポート53（少なくともインターネットアクセスプロバイダのDNSサーバー）から着信UDPトラフィックを許可するルールを追加する必要があります。それはまるで
iptables -A INPUT -p udp --sport 53 -j ACCEPT
他のルールには追加の制限がある可能性があります（ファイアウォール構成を理解できません）。ファイアウォールルールは自動的に作成されたように見えるため、ファイアウォール設定ツールを直接呼び出すのではなく、ファイアウォール設定ツールの設定を変更することをお勧めしますiptables。